In this paper, a general scheme of a 40 kV/2 kA resistive type DC superconducting fault current limiter (SFCL) is suggested, which could be utilized to suppress the surge current caused by short-circuit faults in voltage-source-converter HVDC (VSC-HVDC) power grids. This DC SFCL is designed and fabricated with 6 coil modules in parallel and 4 in series. In order to investigate the current-limiting performance of the DC SFCL under the rapidly rising fault current, the SFCL is tested on the platform with a pulsed DC impact generator. Besides the property of current limitation, the current capacity, insulation and quench recovery performance of such SFCL are also tested. Results indicate that the critical current of SFCL is larger than 2050 A at 69 K, and the DC withstand voltage is larger than 74 kV in 2 hours. During the 9kV DC impact test, the short-circuit current could be limited to 8842 A, and the quench recovery time is less than 200ms.

The flux-coupling type superconducting fault current limiter (FC-SFCL) is suggested to suppress the surge current in voltage sourced converter based HVDC (VSC-HVDC) power systems. One 10 kV/400 A FC-SFCL module with two branches is designed and tested. For the FC-SFCL module, the two branches could use the same or different YBCO tapes. Furthermore the electromagnetic analysis and parameter calculation of the module are performed. In order to study the current-limiting performance of the FC-SFCL under the rapid change of fault current, a dynamic simulation model is established. Finally, the transient properties of FC-SFCL module are simulated and tested. According to the measurement results, the maximum impact current could be limited from 12kA to 6264A, and the largest resistance of SFCL module is about 1.5 Ω when the dc impact voltage is 10kV, which is close to the simulation results.

The two video satellites of the second and third batch of Zhuhai-1 microsatellites (referred to as OVS-2A/3A) are operational with their hyperspectral satellites, which improves the data acquisi-tion capability of the Zhuhai-1 remote sensing satellite constellation. Contrary to the linear array push-broom hyperspectral satellites and plane array CCD video satellites, the OVS satellite is equipped with a planar array Bayer pattern sensor, which can obtain single-band grayscale images by push-broom imaging. Additionally, the Bayer color reconstruction algorithm can interpolate sensor data to provide RGB color band information. Therefore, for the Bayer pattern push-broom sensor, the relative calibration method of linear push-broom or array cameras cannot be directly applied. The radiometric calibration of the Bayer pattern push-broom imaging mode has become a matter of concern; therefore, this study developed a radiometric calibration method for the Bayer pattern push-broom sensor of the OVS satellite and verified its effectiveness and accuracy. OVS images were used to perform on-orbit relative radiometric calibration, and the calibration accu-racy, including streaking metrics and root-mean-square error, was better than 1%, meeting the specification requirements for the OVS satellite. Visually, after calibration correction, the streaking and striping noise of the Bayer images was removed, and the radiometric quality of the image was considerably improved, providing a good data basis for subsequent research in remote sensing applications.

A 0.5 MVA/1 MJ superconducting magnetic energy storage system (SMES) has been installed in a superconducting power substation. The SMES is designed to compensate active power fluctuations, current harmonics and reactive power of the downstream load. The system configurations and control strategies are described. Experimental and field test results show that the proposed SMES can effectively improve the power quality of the power system.

Resistive Superconducting Current Limiter (RSFCL) is a focus in the development of current limit technology, especially in the field of AC transmission. It has a significant effect of limiting current. However, the traditional double-wound non-inductive pancake coil has an inevitable drawback. Due to its special structure the flashover would occur easily during the fault in high voltage envi-ronment. That would make the SFCL working in an uncon-trolled state. So novel coil structures or connection modes are de-manded to meet the protection of Voltage Source Converter based High Voltage Direct Current (VSC-HVDC). In this paper the magnetic distribution of different flux coupling connection modes of the coils is analyzed through the simulations based on continuous pancake coil. A flux coupling type SFCL with pan-cake coils is designed and fabricated. The limitation process of the SFCL coils is analyzed through simulations and experiments in millisecond level. The parallel current sharing characteristics of the coils are researched through experiments in different impulse current. Meanwhile, a continuous pancake coil is made to study the series voltage sharing features of the coil. The result of this paper has certain guiding significance in the design of DC RSFCL.